Subtraction of integers worksheet with 20 problems.

Let's solve each of these subtraction problems involving integers. The key rule to remember is:

> Subtracting a positive number is the same as adding a negative number.
> Subtracting a negative number is the same as adding a positive number.

In general:
- $ a - (+b) = a - b $
- $ a - (-b) = a + b $

We'll go through each problem step by step.

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1) $ (+5) - (+9) = $

$ 5 - 9 = -4 $

✔ Answer: -4

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2) $ (-3) - (+8) = $

$ -3 - 8 = -11 $

✔ Answer: -11

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3) $ (-7) - (0) = $

$ -7 - 0 = -7 $

✔ Answer: -7

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4) $ (+3) - (+3) = $

$ 3 - 3 = 0 $

✔ Answer: 0

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5) $ (+1) - (-9) = $

$ 1 + 9 = 10 $ (subtracting a negative = adding)

✔ Answer: 10

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6) $ (+6) - (+2) = $

$ 6 - 2 = 4 $

✔ Answer: 4

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7) $ (+4) - (+7) = $

$ 4 - 7 = -3 $

✔ Answer: -3

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8) $ (+9) - (+4) = $

$ 9 - 4 = 5 $

✔ Answer: 5

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9) $ (-8) - (+4) = $

$ -8 - 4 = -12 $

✔ Answer: -12

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10) $ (+4) - (0) = $

$ 4 - 0 = 4 $

✔ Answer: 4

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11) $ (+4) - (-7) = $

$ 4 + 7 = 11 $ (subtracting a negative = adding)

✔ Answer: 11

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12) $ (-3) - (+1) = $

$ -3 - 1 = -4 $

✔ Answer: -4

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13) $ (+9) - (0) = $

$ 9 - 0 = 9 $

✔ Answer: 9

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14) $ (+3) - (+5) = $

$ 3 - 5 = -2 $

✔ Answer: -2

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15) $ (-2) - (+3) = $

$ -2 - 3 = -5 $

✔ Answer: -5

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16) $ (+9) - (-5) = $

$ 9 + 5 = 14 $ (subtracting a negative = adding)

✔ Answer: 14

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17) $ (-2) - (+2) = $

$ -2 - 2 = -4 $

✔ Answer: -4

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18) $ (+7) - (+3) = $

$ 7 - 3 = 4 $

✔ Answer: 4

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19) $ (+6) - (0) = $

$ 6 - 0 = 6 $

✔ Answer: 6

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20) $ (+2) - (+5) = $

$ 2 - 5 = -3 $

✔ Answer: -3

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✔ Final Answers:

1) -4
2) -11
3) -7
4) 0
5) 10
6) 4
7) -3
8) 5
9) -12
10) 4
11) 11
12) -4
13) 9
14) -2
15) -5
16) 14
17) -4
18) 4
19) 6
20) -3

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📝 Summary of Key Rules Used:

- Subtracting a positive: move left on number line.
- Subtracting a negative: move right (same as adding).
- Any number minus zero is itself.

Let me know if you'd like this formatted as a printable answer sheet!